Subaru Legacy 2005 Service Manual page 2244

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
R: DTC P0758 SHIFT SOLENOID "B" ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of 2-4 brake duty solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock
WIRING DIAGRAM:
B11
3 4
1 2
5 6 7 8
9 10 11 12
14 15
13 16
17 18 19 20
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B55) No. 6 — (B11) No. 3:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 6 — Chassis ground:
3 CHECK 2-4 BRAKE DUTY SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 3 — No. 20:
TRANSMISSION
B55
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 27 28 29 30 31
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance 2.0 — 6.0 Ω? Go to step 4.
4AT(diag)-72
B55
TCM
B11
T4
AT3
2-4 BRAKE
DUTY
SOLENOID
AT3
1 2 3
4 5 6
Check Yes
Go to step 2. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 7.
AT-01488
No